Reclosing mechanism for circuit breakers



June 10, 1930. A HOSNER 1,762,298

RECLOSING MECHANISM FOR CIRCUIT BREAKERS Filed Dec. 27. 1926 6Sheets-Sheet l Auerw Hroner,a 31h/vanto@ atteind,

June 10, 1930. A. HOSNER nscLosING MEcHANlsM FOR c IRcu1T`BREAKERs FiledDeo. 27. 1926 6 Sheets-Sheet M wil@ um AmeA n #IWW/ww W www y.aff/r. 9U5 r e n 6. s a L. L v r ua A JuneV 1o, 1930. A. L. HOSNER 1,762,298

RECLOSING MECHANISM FOR CIRCUIT BREAKERS f i a l' `sleuf, @A l l 61mm,

June l0, 1930. A. L. HosNER RECLOSING MEQHANISM FOR CIRCUIT BREAKERS 6Sheets-Sheet 4 Filed Dec. 27. 1926 Auem L. Hsner,

V\/'+ eases @f/- June. 10, 1930, A.,-L. HosNER 1,752,298

RECLOSING MECHANISM FOR CIRCUIT BREAKERS Filed neo. 2v'. 1926 esheets-sheet 5 June l0, 1930. A. L. HosNER RECLOSING MECHANISM FORCIRCUIT BREAKERS esheets-sneet e Filed Dec. 27, 1926 Avem L. Hoshevr,jmmr Patented .Iene-1o, 1930 PATENT OFFICE .AVERY L. HOSNEB, FTELLUBIDE, COLORADO RECLOSING MECHANISM FOR CIRCUIT BREAKERS Applicationled December-27, 1926. Serial No. 157,387.

This invention relates to the class of circuit makers and breakers andpertains particularly to a self-operating re-closing circuit breaker.

This invention has for its primary object the rovision, in a manner ashereinafter set 'fort of anvelectrical circuit breaker having meansassociated therewith for reversing the o ration of the device tore-close the broken circuit. Another object is the provision, in amanner as hereinafter set forth, of an electrical circuit breaker havingmeans associated therewith whereby several lattempts will beautomatically made for re-closing the open circuit.

Still another object of the invention is the provision, in a mannerhereinafter set forth, of an electrical circuit breaker mechanism havingassociated means set in operation immediately upon the breaking of thecircuit, for at once automatically re-closing the circuit, or aplurality'of times in the event that the short circuit in the line inwhich the device is {'sed, continues for a'short while, and furtherhaving means whereby, in the event the short circuit is permanent, theresetting mechanism will be caused to cease operation. Other objects andadvantages of the invention will be seenas the description proceeds, andthe invention will be best understood from a consideration of thefollowing detailed description taken in connection with the accompanyingdrawin forming a part of this specification, with t e understandlng,however, that the invention is not confined to any strict conformitywith the showing of the drawings, but may be changed or modified so longas such changes or modifications mark no material departure from thesalient Yfeatures of the invention, as expressed in the aplplndedclaims.

the drawings:

Figure 1 shows in side elevation a mechanism embod 'ng this invention,as set up upon a switc board.

Figure 2 shows in side elevation the upper portion of the mechanismembodying this 1nvention, same being'shown enlarged and also poing shownin dotted lines in operative posi'- ion.

Figure 3 is a front view of the upper portion of a circuit breakingmechanism.

Figure 4 shows a part of the re-setting mechanism and self-operativeswitch mounted upon one end of a motor housing.

Figure 5 shows the above mentioned motor houslng in longitudinal sectionshowing the mechanism within and attached to the ends of the same. l

Figure 6 is a transverse sect-ion through the motor housing showingcertain details of construction therein.

Figure 7 shows in detail the re-setting cam which is mounted upon oneendv of the motor housing, and the re-setting lever upon which the camoperates.

Figure 8 shows in top plan a the circuit breaking mechanism the rear ofthe switchboard.

ortion of ocated at Figure 9 shows the arrangement of ceri tain weightsand'pulleys mounted upon the rear of the switchboard.

Figure 10 is a section taken on line 10-10 of Figure 2.

Figure 11 is an enlarged view, in side eleyation, of the ily-ballmechanism operating upon the controlmotor shaft.-

Figure 12 is an end view of the iiy-ball mechanism.

Figure 13is a longitudinal sectional view of the {1y-ball mechanism.

Fi re 14 is a transverse section taken upon the 1ine`14-14 ofthe Figure13.

Figure 15 is a side elevation of the operating switch.

Figure 16 is a detailed side elevation of the circuit breaker tripmechanism.

Figure 17 is a transverse section ofthe lower portion of the ratchetplate, and

Figure 18 is the diagrammatic view of the mechanism operating motorcircuit, showing certaincontrol switches therein.

`Referring now'to the drawings 1n detail, wherein like numerals ofreference indicate corresponding parts throughout the several views, thenumeral 1 indicates a switchboard or panel upon which structures of thecharacter embodying this invention are usually mounted.

Upon the outer face of the switchboard 1 is mounted a tripping coil 2having a longitudinally extending vertically reciprocating core 3 whichcarries on its upper end the hammerhead 4. Extending upwardly from therear of the tripping coil 2, is a plate 5 which is secured to the faceof the switchboard 1, and exten-ding :trom the upper portion of thisplate 5 is a pair of outwardly projecting spaced parallel arms 6, anddepending rom the lower edge of each of these arms 6, is an ear 7.

Extending forwardly from the body of the tripping coil 2 is a supportingarm 8 upon the outer ends of which is pivotally mounted an operatinglever 9 which, as is clearly shown in Figure 3, is formed of a pair ofspaced parallel members 10 joined at their upper ends by the hand grip11. The operating lever 9 is normally arranged in vertical position asshown in Figures 1 and 2, the arm extending across the forward ends otthe bracket arms 6.

Extending transversely between the members 10 of the arm 9 is theretaining pin 12 which pin is normally engaged by the hook end 13 of alatch finger 14 pivotally mounted intermediate its ends, upon the pin15, and between the bracket arms 6. The inner end oi' the latch finger14 may be weighted as indicated at 16 to cause the free end of the latchto remain in engagement with the pin 12.

Pivotally mounted between the depending ngers 7 of the bracket 6 is atrip lever 17, one end of which is turned at right angles downwardly asindicated at 18, and this trip lever is mounted between the dependinglingers 7 substantially midway between the downturned end and the otherend thereof. The straight free end of the trip arm 17 has a linkconnecting the same with the hook end of the member 14, as indicated bythe numeral 18.

Mounted upon the rear of the switchboard or panel 1, is a two-armedbracket 19 and formed through the panel l adjacent the upper portion ofthe bracket 19 is a passage 20. Pivotally mounted as at 21, between thetree ends of the arms of the bracket 19, is a bell crank member 22provided with the arms 23 and 24, as shown in Figure 2.

Pivotally connected by the head 25 and pin 26, to the free end of thearm 23 of the bell crank, is a rod member 27 which extends through theaperture 2O in the panel 1 and terminates at its forward end in theelongated slot portion 28 provided with the longitudinally extendingslot 29. A retaining pin 30 passes through the slot 29 and engages oneside of the lever 9, and the pin 30 is designed to slide in the slot 29,as is readily apparent.

Pivotally attached to the lever 9 beneath the outer end of the swingingarm 17 is a trip element indicated generally by the numeral 31. Thistrip element comprises a relatively long arm portion 32 which isattached at one end to the lever 9 as above described, and a short linkportion 33 has one end pivotally attached to the extension 28 of the rod27 adjacent the inner end ot the slot 29, while the other end isattached to the inner end of the long arm portion 32. This short link 33of the trip element has that end which is attached to the long portion32 turned upwardly at right angles as indicated at 34, and this upturnedportion 34 has a lateral extension 35 at the free end which is designe-dto strike the lower end of t-he downturned portion 18 of the swingingarm 17. The inner end of the portion 32 of the tripping elelnent hasextended therefrom a tongue 36 and this tongue is designed to be engagedby the latch 370i a locking latch indicated generally by the numeral 38,which locking latch is provided with the depending tail portion 39. Thetail portion 39 of the latch 38 is arranged directly over the hammer 4to be struck thereby when th. tripping coil 2 is energized. It will bereadily seen that upon disengagement of the latch 38 from the tongue 36the tripping element members 32 and 33 will be unlocked and the same maythen be broken upwardly.

The lever 9 is provided with means for manually disengaging the upturnedend 13 of the pivoted element 14 which comprises' an elongated rod 40which extends downwardly between members l0 of the lever and terminatesat its lower end in an offset portion 41 which overlies the member 14.The upper portion of the rod 4() passes through the handpgrip 11 andterminates in a thuml` button 42, projecting above the top of the handgrip as shown. A suitable spring element 43 operates to maintain the rodin raised disengaged position with respect to the member 14.

Attached to hand grip 11 is one end of a cable 44 which passes throughthe switchboard 1 and over a pair of pulleys 45 and 46 and carries atits other end the freely suspended weight element 47. The purpose ofthis weight element will be described hereafter.

The arm 24 of the bell crank 22 has pivotally and adjustably attached tothe tree end thereof a depending link member 48, the lower end of whichis pivotally attached to one end of an arm 49, forming a part of a bellcrank lever indicated generally by the numeral 50.

A bell crank lever 50 is pivotally mounted between the arms of uprightbracket 51 and the other arm 52 of the bell crank lever has pivotallyattached to the free end thereof the rod 53 which is adapted to engagethe circuit controlling switches in connection with which this circuitbreaker and re-closing mechanism is designed to be used. No particularstrucllO ture of switch is shown in connection with this mechanism forthe same can operate upon or in connection with any type of circuitcontrolling device in connection with which these structures are used.-

The pivot pin 26 which connects the head 25 of the rod 27 with the arm23 of the bell crank lever 22 is provided with an extension 54 which hasan aperture formed therethrough.

vMounted upon the back of the panel 1 is a switch base 55 having thecontact points 56 and 57, to one of which points the knife switch 58 ispivotally attached to swing in-.l Wardly to engage with the othercontact point. Pivotally attached to the free end of the switch blade 58is an arm 59 which extends rearwardly and is formed to set up a reducedextension 60 at the free end thereof. This reduced extension extendsthrough the aperture in pivot pin extension 54 and terminates in a head61 while the point of joinder between the extension 60 and the arm 59sets up an abutment 62 which will hereinafter be referred to. p Y

Mounted beneath the tripping coil 2, either upon the board 1 or thefloor from which the board 1 extends, is a housing 63 in which isencased an electric motor 64. Upon the armature shaft 65 of the motor64, there is mounted a worm 66 which engages the worm gear 67 which ismounted upon a vertical shaft 68.

The shaft 68 has its upper and lower ends mounted in bearings in the topand bottom of' the casing 63 as shown in Figure 6, and upon the upperend of the shaft 68 there is mounted a worm 69 which meshes with a wormgear 7() which is mounted upon the cam and ratchet plate operating shaft71 which extends horizontally and longitudinally through the casing 63.As is clearly shown in Figure 5 the shaft 71 has its ends extendingthrough the end walls of the casing 63 in which it is mounted.

The free end of the armature shaft has a fly-ball mechanism indicatedgenerally by the numeral 72, mounted thereon. This fly# ball mechanismcomprises ahead portion 73 which is attached to the armature shaft, andextending from this head 73 is an elongated sleeve 74. The sleeve 74 isprovided adjacent its inner end with the diametrically oppositelypositioned short longitudinally extending slots 75.

Surrounding the head 73 is a collar 76, and this collar has slightlongitudinal movement upon the head, as will be hereinafter explained.

Set in the forward end of the sleeve 74 is a collar 77 and this collaris secured to the sleeve by the screw members 78 as shown in Figure 13.Connecting between the collar 76 and the forward end of the sleeve 7 7is a plurality of resilient members 79 each having one end secured tothe collar 76 and the other secured to the forward end of the sleeve 74,and each of these resilient members carries intermediate its ends aweight member 80.

WVithin the rear end of the sleeve 74 is a freely slidable body 81having the laterally projecting ears 82 which extend through the slot 75. Forwardly of the body 81 within the sleeve 74 is an elongated plungermember 83, having a head 84 at the inner end thereof and against whichthe forward portion of the body 81 bears. Around the plunger 83 is aspring 85, one end of which bears against the collar 77 while the otherend bears against the under side of the head 84, thus causing theplunger to be normally drawn into the sleeve against the body 81 in themanner shown. The outer end of the'plunger 83 extends beyond the sleeve74 and has a pin member 86 thereabout, and when the fly-ball mechanismis in position upon the end of the motor armature shaft 65 the end ofthe sleeve 74 bears against the inner side of the end wall of the casing63 while the plunger extends through the wall and the pin 86 is normallydrawn into the slot formed therefor in the outer face of thewall by theaction of the spring 85, and is thus prevented from turning. As shownthe plunger 83 projects a slight distance beyond the pin-86 and thepurppse for this extension will be set forth herea ter.

Mounted upon the outer side of that end wall through which the ily-ballmechanism 72 extends is a ratchet plate element indicated generally bythe numeral 87. As shown this plate 87 is elongated and has each endthereof of arcuate contour. One of these arcuate ends is formed to setup the plurality of ratchet teeth 88 while the opposite arcuate end ofthe plate has the inner face thereof formed to provide a plurality ofbeveled slots or teeth 89. The plate 87 is pivotally mounted upon theheaded member 90 which revolubly secures the plate to the wall ofthecasing 63. The beveled slots 89 overlie and swing across the end of theplunger element 83, of the fly-ball mechanism as is shown in Figure 5.Formed through the wall of the casing 63 upon which the ratchet plate 87is mounted, and formed upon the same arc as the lower edge of the plate,is a yplurality of threaded apertures 91 into any one of which a stoppin 92 may be inserted. As shown in Figure 4 the stop pin 92 engages oneside of the plate 87 and limits its swinging movement. Attached tion. Atthe upper end of the plate 87 there is secured to the outer face thereofa tooth or lugv95 termed a lockout lug. This lug or tooth 95 has itspoint arranged beyond the 3 il; Y

row of ratchet teeth 88 at the lower side edge of the plate, as shown.

As previously stated the shaft 71 extends at each end through the endwalls of the casing 63 and that end which extends through the wall uponwhich the plate 87 is mounted is reduced and has secured thereto a pairof rings or collars 96 and 97, the same being secured to the shaft byset screws. Set in the periphery of the ring 97 is a ratchet pin 98which, under certain conditions engages the lockout lug 95. A. ratchetpin 99 is set in the periphery of the ring 96 and is designed to engagethe teeth 88 when the shaft 71 is revolved and the lockout pin being setbeyond the face of the plate 87 engages the lockout lug 95 when theplate has been swung around to that position which enables the ratchetpin 99 to engage the last one of the ratchet teeth adjacent this lug, aswill be explained in the descriptionof the operation of the device. Asshown in Figure 4 the pins 98 and 99 are spaced 90 degrees apart aboutthe collar.

Upon the other end of shaft 71, there is mounted, exteriorly of thecasing 63, the cam body 100, this cam being arranged between the spacedparallel arms 101 the lower ends of which arms are secured together asindicated at 102 and further having extending therebetween a pin 103which rests against the periphery of the cam and constitutes a cam seat.rllhe upper ends of the arms 101 are pivotally attached by means of thehead 104, to the link 105 which is adjustably attached to this head, andthe upper end of this link is also adjustably attached to a head 106, towhich head there is pivotallyl connected a pair of links 107 and 108.The link 107 is attached to the arm 8 which carries the lower end of thelever 9, and the link 108 has its other end connected to the lever 9adjacent the upper end thereof as shown in Figures 1 and 2.

Mountedupon that end wall of the motor housing 63 upon which the ratchetplate 87 is positioned, adjacent the upper portion of the ratchet plate,is a body of insulation 109, the upper portion of which carries a pairof bracket electrical terminals 110. Pivotally mounted at the outer endof an outwardly extending arm 111, upon the body 109, is an arm 112, oneend of which is attached to this p arm 111, while the other end thereofis pivotally attached to a body 113 which carries a series of elongatedcopper leaves 114, which, when raised upwardly reach between theterminals 110 forming an electrical conductor therebetween.

Attached at one end to the central portion of the arm 112 is avertically reciprocating switch operating arm 115, the lower end ofwhich is slotted as indicated at 116, and there extends through thisslot a guide and retaining pin 117 extending outwardly from the wall ofthe housing upon which this switch structure is mounted.

From the inner side of the switch operating arm 115 there is positioneda trip element comprising upper and lower members 118 and 119respectively, the lower end ofthe member 119 being mounted to revolveabout the pin 117 and the upper end of the member 118 pivotally securedto the arm 115. The elements 118 and 119 are pivotally connectedtogether as indicated at 120, and when pressure is applied to thispivotal connection, the joint will be broken and will allow the arm 115to drop back, pulling upon the link 112 to draw the contact element 114away from the terminals 110. The downward movement of the terminalconnecting member 114 is as' sisted by a spring 121, one end of which isattached to the link 112 and the other end to the body 109.

In Figure 18 there is shown diagrammatically a feed line to the motor64, the self operating switch shown in Figure 4 having the connectingelement 114, being shown and designated 114, and the switch operated bythe bell crank 22, and acting through the knife blade l58 to close thepoints between the contacts 56 and 57 being here shown and indicated as58. The other switch in this diagram, designated 122 is an auxiliaryswitch and may or may not be used as desired, to permanently disconnectthe motor from the mechanism if it is desired to prevent the reclosingdevice from operating. However, if this is desired the self-operativeswitch may be opened to produce this result.

As the particular wirinr means for this structure form no part of thepresent invention, wiring connect-ions between the various electricalelements have been omitted, a description of the connection between theparts being thought suiiicient.

This reclosing mechanism is especially adapted for use in connectionwith automatic circuit breakers. The rod 53 of the reclosing mechanismis adapted to be connected with the blades of a circuit breaker of thistype in the usual manner. The tripping coil 2 is adapted to be connectedto the line protected by the circuit breaker in such manner that it willbe energized when an overload effects the opening of the circuitbreaker. The energize.- tion of the coil 2 causes the core 3 to moveupwardly with the result that the hammer 4 operates the trip member ortrigger 38. This unlocks the member 32 and 33 causing this tripmechanism to break and iy upwardly as indicated in dotted lines inFigure 2, allowing the rod 27 to move through the board 1 toward theoperating lever'9 with consequent movement of the attached link and rod48 and 53. This movement of the rod 27 is caused by the opening of thecircuit breaker dun to the connection of the rod 53 with the blades ofthe circuit breaker. The inward movement of the finger 54 with the rod27 causes the finger to contact with the abutment 62 to close the knifeblade 58 between the contacts 56 and 57. At the same time that the 'tripelement 31 operates, the lateral extension 35 upon the trip member 33strikes the downturned portion of pivoted arm 17 causing the same topull down upon the upturned finger 13 and freeing the lever 9. When theknife blade 58 has made proper contact electrical current will betransmitted to the motor 64 to start the same and this will consequentlycause a revolution of the shafts 68 and 7l. At the same time that themot-or starts the flyball mechanism will become operative and the weightelement of this mechanism will be thrown outwardly by centrifugal forcecausing the outward projection of the plunger member 83 and causing thefree outer end of this plunger member to engage in the grooved surfaceat the rear of the ratchet plate 87.

As the shaft 71 revolves with the starting ofthe motor, the cam 100revolving in a clockwise manner will bear down upon pin 103 to draw downthe arms 101 and 105. This will cause the outward and downward swingingof the lever 9 and will raise the weight 47. As the lever 9 swingsoutwardly the trip mechanism will be straightened and the elements 32and 33 of the mechanism 31 will then become locked together in themanner shown in Figure 16. (lo-incidental with the above describedoperation through the medium of the cam 100, the collars 96 and 97 willbe revolved and the ratchet pin 99 will engage the first of the teeth 88upon the plate 87. This will cause the plate to revolve about itsretaining member 90 and reset grooves 89 will move across the outer endof the plunger 83 to position the plunger in the next one of thegrooves. At approximately this point the cam 100 will have completed arevolution releasing the arm 101 and allowing the weight member to diopto again raise the lever 9 to upright position and as the ytripmechanism has been straightened and the elements locked togetlier, therod 27 and the circuit breaker will be freed so as to permit the latterto close.

.With the return of the rod 27 to its first po- .sition the finger 54will hit the head 61 of the rod 60 and pull upon the saine to open theswitch 58 thus cutting off the current to the motor 64.

Ifthe short circuit in the system is a temorarv condition, such as mightbe caused y a discharge of lightning, then the circuit will be properlyrestored and the motor upon stopping will cause the fly-ball mechanismto stop and spring 85 will return the plunger 83 to its normal position,thus disengaging the plate 87 The spring 93 of the plate 87 will causethe same to swing backwardly in the position shown in Figure 4. If,however, the short circuit is caused by a permanent ground, the instantthe switchI in the system, which was opened by the circulit breaker, isclosed the tripping coil 2 will again operate to repeat the firstdescribed movement, again closing the knife blade between the points 56and 57, thus setting up the `operation of the motor as described. Thisaction will be brought about so quickly that the slight centrifugalforce imparted to the fly-ball mechanism will have caused the same tocontinue revolving and thus the motor will have started up again beforethe fly-ball mechanism stops moving, therefore, the forward end of theplunger 83 will not yet be disconnected from the grooved spaces 89 ofthe plate 87. The shaft 71 again revolving causes the tooth 99 to engagethe next of the ratchet teeth 88 and will thus swing the plate 87 onepoint further and this opening and closing operation of the circuitbreaker controlled switch will continue until the plate 87 has swung tothe opposite position from that shown in Figure 4, whereupon when thetooth 99 engages the last one of the ratchet teeth 88 the lug 95 willAthen be in position to be engaged by the tooth 98 and the plate 87 willbe swung far enough to break the joints between the members 118 and 119and thus through the medium of this self-operating switch the circuitfeeding motor 64 will be permanentlybroken and operation of there-closing mechanism will be stopped. The lockout pin 98 will stop theplate 87 in that position where the cam 100 Will be arranged to hold thearms 101 down, thus preventing theweight 47 from dropping and againreleasing the circuit breaker. The plate 87 is here shown as beingprovided with six teeth and from this it will be apparent that sixattempts will be made by the device to restore the circuit and if theground is a permanent one each of the six attempts will fail, but, thedevice can be so set by fixing the pin 92 throu h any one of the holes91, that a fewer numger of attempts -will b e made by the mechanism toclose the circuit and, therefore, permanent disconnection of the samewill more quickly be made.

Having thus described my invention, what I claim is:

1. A re-establisher of the character described adapted for use with anelectrical circuit, comprising a reciprocating bar, connecting meansattached to one end of .said bar for o ening and closing a circuit, atrip member esigned. to maintain said bar 1n set position, means formoving said bar under a.

iedetermined condition, a motor adapted to be energized upon the forwardmovement of said bar, a cam operated by said motor, means operated bysaid cam for resetting said trip, and means operating after theresetting of said trip to reverse the movement of said bar andconnecting means to reclose said first-mentioned means.

lll

2. A re-establisher of the character described adapted for use with anelectrical circuit, comprlsing a reciprocating bar, connecting meansattached to one end of said bar for opening and closing a circuit, atrip member designed to maintain said bar in set position, means formoving said bar under a predetermined condition, a motor adapted to beenergized upon the forward movement of said bar, resetting said trip,and means operating after the resetting of said trip to reverse themovement of said bar and connecting means for deenergizing said motor.

3. A re-establisher, a normally vertically positioned pivoted lever, areciprocable bar slidably connected at one end to said lever and adaptedto connect at the other end thereof with a circuit control means, a triparm connected between said lever and said bar, a motor adapted to beenergized upon the forward movement of said bar, a cam member revolvedby said motor, means operated by said cam for swinging said lever toreset said trip, and means operating upon said lever after resettin saidtrip to reverse the movement of said ar.

4. A re-establisher, a normally vertically positioned pivoted lever, areciprocablebar slidably connected at one .end to said lever, andadapted to connect at the other end thereof with a circuit controlmeans, a trip arm connected between said lever and said bar, a motoradapted to be energized upon the forward movement of saidV bar, a cammember revolved by said motor, means operated by said cam for swingingsaid lever to reset said trip, and means operating upon said lever afterresetting said trip, to reverse the movement of said bar, and meanscontrolled by said motor whereby, in the event of a prolonged overloadon said circuit, said bar will be shifted a plurality of times in anattempt to re-establish a circuit.

5. A re-establisher, a normally vertically positioned pivoted lever, areciprocable bar slidably connected at one end to said lever, andadapted to connect at the other end thereof with a circuit controlmeans, a trip arm connected between said lever and said bar, a motoradapted to b e energized upon the forward movement of said bar, a cammember revolved by said motor, means operated by said cam for swingingsaid lever to reset said trip, and means operating upon said lever afterresetting said trip, to reverse the movement of said bar, and meanswhereby a plurality of attempts will be madeV to automaticallyreestablish said circuit, and said motor adapted to be permanentlydeenergized after a plurality of attempts have been made to energize themotor, to leave said motor deenerglzed until the circuit controllingsaid motor 1s manually closed.

6. A mechanism for use in connection with a circuit breaker, for makinga plurality of attempts to re-establish a circuit, comprising a motor,means controlled by said motor for resetting said circuit breaker, aplate pivotally mounted adjacent said motor and having one edge providedwith a plurality of teeth and further having the inner face adjacent oneedge provided with a plurality of beveled grooves, a centrifugallycontrolled element adapted to revolve with said motor and designed toshift to engage in one of said beveled grooves, revolving means forengaging one of said teeth each time said circuit breaker is reset, saidgroove engaging element holding said plate momentarily through themomentum imparted thereto bythe motor, and means designed to be trippedby said plate after failure of a plurality of attempts to reset thecircuit breaker, for disconnecting the power to said motor.

In testimony whereof I affix my signature.

AVERY L. HOSNER.

